Suction valve foe aie compeessoes



(No Maw.)

- P. NBUKRCH.

SUCTION VALVE FUR AIR OOMPRESSORS.

No. 511,248. Patented 1360.19, 1893.

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` FRIEDRICH NEUKIRCH,

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SUCTION-VALVE. FOR AIR-COMPRESSORS.

SPECIFICATION forming part of Letters Patent No. 511,248, dated December 19, 1893. Application tiled August 12. 1893. SerialNo. 482,975. (No model.) Patented in Italy February 7, 1893,11XV. 371.

. have been obtained in Italy, dated February nesting-rod o.

7 1S93,LXV,371,) ol' which the following is a specification.

For every air compressing machine, it is of importance, first, that the air shall enter the compressing cylinder as freely as possible; secondly, that the suction valve shall close at the proper moment, and, thirdly, that the suction valve shall also open at the proper rnoment, namely at the point when the air under pressure remaining in the dead space of the cylinder is expanded to such an extent as not to be appreciably above the pressure of the atmosphere.

The present invention has for its object to fulfill these conditions. I will proceed to de scribe the same with reference to the accompanying drawings in Which-- Figure lshows a vertical section of a single acting compressing cylinder with my invention applied thereto. Fig. 2 shows a similar section with a slightly modified construction and Fig. 3 shows an enlarged section of the suction valve and parts in connection therewith.

In order to obtain a large area of opening for the admission valve o. this is placed on a passage formed through the piston p to a pin lc on which-is directly pivoted the crank con- To the side of the connecting rod-head is attached one end ofa link g, pivoted to a pin h, the other end of which link is connected either directly to the valve stem s as at Fig. 1 or as at Fig. 2 to an intermediate point of a lever Z one end of which is pivoted to the piston p While the other end is pivoted to the stem s. The upper end of this stem carries a screw nut m, against a rim on which bears a Washer 'n.2 that is pressed upon by one end of a helical spring o Whose other end bears against the bottom of a socket a of the valve through which the stem s passes. In the arrangement at Figs. 2 and 3 a ring rr' is secured in the socket by a screw cap o, in

which is contained a second helical spring o the lower end of which bears against another washer n 4that rests on the upper side of the ring r, and also upon the flange of the nut m. The before mentioned washer n2 is also made to bear against the under side of the ring r by the spring o when the parts are in the position shown at Fig. 3.

It the upper surface of the valve a kis subject to a greater air pressure than the pressure exerted by the spring o which will be the case when it is at the end of the upstroke, such excess of pressure will prevent any upward pressure exerted by the angular motion of the connecting rod and link g upon the valve stem s from opening the valve, the resulting upward motion of the stem s being made to effect the compression of the spring o. When the piston has moved downward 'slightlyi'rom the upper end stroke, the pressure above it will be reduced by the eXpansion of the air contained in the dead space, whereupon the valve a, will be forced open, as soon as the pressure of the spring o is sufficiently in excess of the air pressure for this purpose.

In the lowest position of the piston the suction valve will be closed by the angular motion of the connecting rod and link g, and it will be held closed during the upstroke. After the valve is closed, and during the upstroke, the stem s will be moved still farther downward by the angular motion of the con necting rod, and in pressing upon the ring n2 with the nut m, it will compress the spring o more or less, causing this to press the valve a tightly down upon its seat. When arrived at the end of the upstroke, the angular mo tion of the connecting rod and link g will tend to open the valve a but this will be prevented by the excess of pressure of the compressed air above the piston, until on the commencement of the downstroke, the pressure of the spring o is sufficient to overcome the diminished air pressure, as before explained.

In the arrangement shown at Fig. l the upper spring o' being omitted, the opening of the valve at the commencement of the down stroke will only take place when the air above the piston has, by expansion, had its pressure reduced below that of the atmosphere.

Having thus described the nature of this invention and the best means I know for cztr` rying the same into practical eect, I claim- 1. In a, single acting air compressing cylinder, the combination, with the piston, of a suction Valve a whose stem s is connected by a. link g either directly or indirectly With a, pin b on the connecting rod head situated to one side of the pivot pin 7c thereof so that the angular m\otion of the connecting rod in one direction tends to open the said valve, While the angular motion in the other direction tends to close the valve, substantially as described.

2. In a. single acting air compressing cylinder, the combination with the piston of e. suction valve ct `whose stem s is connected therewith through n spring or springs and is two subscribing Witnesses, this 28th day of July, A. D. 1893.

FRIEDRICH NEUKIRCH.

Witnesses:

HEINRICH J. BEHRENS, HERM. PIECHOTTA. 

